适用于为声学信号提供混响、延时或频移的设备。它涵盖了通常用于在录音、广播和公共广播系统上实现特殊效果的设备类型。提供用于人工混响、延时和移频设备的特殊特性和相应测量方法的详细信息。

Applies to devices intended to give reverberation, time delay or frequency shift to signals of an acoustical origin. It covers the types of devices commonly employed to achieve special effects on sound recording, broadcasting and public-address systems. Provides details of the special characteristics and corresponding methods of measurement to be used for artificial reverberation, time delay and frequency shift equipment.